Text annotation having its own layout space separate from the rest of the plot?

Hi,

Is there a way to place a text annotation at the very bottom of the page, such that it would never overlap or cram too near to the x axis title, but rather the x axis title (and all other plot content) would push up a little from it, making it like an anchor above which the real plot content begins?

Alternatively, can we place a QR code somewhere on the page such that none of the plot information will overlap with it?

I just need some place where my plots can say which source file had generated them, either as text or through a QR code. If all else fails Iā€™d make that a second title row if titles can have line breaks.

Thanks!